Dermis & Hypodermis

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Last updated 5:45 PM on 9/26/23
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7 Terms

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Dermis
The layer of skin located just below the epidermis, composed of dense irregular connective tissue, nerves, vessels, sweat glands, and hair follicles.
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Dermal papillae
The wavy layer between the epidermis and dermis that causes fingerprints (epidermal ridges) and increases friction for better object grip.
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Papillary layer
The upper layer of the dermis, made of loose connective tissue.
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Reticular layer
The lower layer of the dermis, made of bundles of collagen fibers.
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Lines of cleavage
The arrangement of collagen fibers in the dermis, which indicate the direction of tension. Surgeons should make incisions parallel to these lines for quicker healing and less scar tissue formation.
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Hypodermis
Also known as the subcutaneous layer, it is not part of the skin but connects the skin to muscle or bone. Composed of loose, fatty connective tissue that insulates, stores nutrients, and attaches the dermis to underlying organs.
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Layers of dermis

Papillary, reticular